1
|
Liu H, Wang Z, Li X, Zhao B, Li H, Han L, Yan J. CeO 2 Nanoparticle Bioactive Materials Promote MG-63 Osteogenic Differentiation and Antioxidant Activity Through NRF2 Signaling. Appl Biochem Biotechnol 2024; 196:4337-4351. [PMID: 37947945 DOI: 10.1007/s12010-023-04766-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/31/2023] [Indexed: 11/12/2023]
Abstract
The incidence of bone-related diseases is higher in the elderly population, which greatly affects the patients' quality of life. Throughout this research, we synthesized a biocomposite nanomaterial of CeO2. The unique structural characteristics of CeO2 nanoparticles (CeO2 NPs) were studied by means of XRD, TEM, and SEM. Nanoparticles of an osteosarcoma cell line (MG-63) were assayed for ALP enzyme levels, key proteins in osteoblasts, and stained with Alizarin Red S to assess the physical properties, bioactivity, and calcium deposition of the osteosarcoma cell line. Moreover, we used H2O2 to construct an oxidative stress model to evaluate the antioxidant activity of CeO2 NPs. Experimental data showed that the CeO2 NPs increased the antioxidant capacity of MG-63 cells and significantly increased alkaline phosphatase activity, calcium deposition, and bone growth as manifested by increased expression of bone differentiation proteins BMP2, OCN, OPN, and type I collagen. Interestingly, RNA interference and functional recovery experiments confirmed that CeO2 NPs enhanced the antioxidant activity of MG-63 cells related to NRF2 signaling. In conclusion, the material is expected to be a potential treatment for bone-related diseases.
Collapse
Affiliation(s)
- Haijuan Liu
- Department of Endocrinology, Liaocheng People's Hospital, Clinical Hospital of Shandong First Medical University, Liaocheng, 252000, China
| | - Zidong Wang
- Department of Orthopaedic Surgery, Liaocheng People's Hospital, Clinical Hospital of Shandong First Medical University, Liaocheng, 252000, China
| | - Xian Li
- School of Clinical Medicine, Weifang Medical University, Weifang, 261053, China
| | - Bei Zhao
- Department of Orthopaedic Surgery, Liaocheng People's Hospital, Clinical Hospital of Shandong First Medical University, Liaocheng, 252000, China
| | - Hao Li
- Department of Orthopaedic Surgery, Liaocheng People's Hospital, Clinical Hospital of Shandong First Medical University, Liaocheng, 252000, China
| | - Liren Han
- Department of Orthopaedic Surgery, Liaocheng People's Hospital, Clinical Hospital of Shandong First Medical University, Liaocheng, 252000, China.
| | - Jun Yan
- Department of Orthopaedic Surgery, Liaocheng People's Hospital, Clinical Hospital of Shandong First Medical University, Liaocheng, 252000, China.
| |
Collapse
|
2
|
Cho Y, Kim YK. ROS-mediated cytoplasmic localization of CARM1 induces mitochondrial fission through DRP1 methylation. Redox Biol 2024; 73:103212. [PMID: 38838552 PMCID: PMC11179627 DOI: 10.1016/j.redox.2024.103212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2024] [Revised: 05/23/2024] [Accepted: 05/24/2024] [Indexed: 06/07/2024] Open
Abstract
The dynamic regulation of mitochondria through fission and fusion is essential for maintaining cellular homeostasis. In this study, we discovered a role of coactivator-associated arginine methyltransferase 1 (CARM1) in mitochondrial dynamics. CARM1 methylates specific residues (R403 and R634) on dynamin-related protein 1 (DRP1). Methylated DRP1 interacts with mitochondrial fission factor (Mff) and forms self-assembly on the outer mitochondrial membrane, thereby triggering fission, reducing oxygen consumption, and increasing reactive oxygen species (ROS) production. This sets in motion a feedback loop that facilitates the translocation of CARM1 from the nucleus to the cytoplasm, enhancing DRP1 methylation and ROS production through mitochondrial fragmentation. Consequently, ROS reinforces the CARM1-DRP1-ROS axis, resulting in cellular senescence. Depletion of CARM1 or DRP1 impedes cellular senescence by reducing ROS accumulation. The uncovering of the above-described mechanism fills a missing piece in the vicious cycle of ROS-induced senescence and contributes to a better understanding of the aging process.
Collapse
Affiliation(s)
- Yena Cho
- Muscle Physiome Research Center and Research Institute of Pharmaceutical Sciences, Sookmyung Women's University, Seoul, 04310, Republic of Korea; College of Pharmacy, Sookmyung Women's University, Seoul, 04310, Republic of Korea
| | - Yong Kee Kim
- Muscle Physiome Research Center and Research Institute of Pharmaceutical Sciences, Sookmyung Women's University, Seoul, 04310, Republic of Korea; College of Pharmacy, Sookmyung Women's University, Seoul, 04310, Republic of Korea.
| |
Collapse
|
3
|
Nayeem N, Sauma S, Ahad A, Rameau R, Kebadze S, Bazett M, Park BJ, Casaccia P, Prabha S, Hubbard K, Contel M. Insights into Mechanisms and Promising Triple Negative Breast Cancer Therapeutic Potential for a Water-Soluble Ruthenium Compound. ACS Pharmacol Transl Sci 2024; 7:1364-1376. [PMID: 38751641 PMCID: PMC11092013 DOI: 10.1021/acsptsci.4c00020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 03/14/2024] [Accepted: 03/22/2024] [Indexed: 05/18/2024]
Abstract
Triple negative breast cancer (TNBC) represents a subtype of breast cancer that does not express the three major prognostic receptors of human epidermal growth factor receptor 2 (HER2), progesterone (PR), and estrogen (ER). This limits treatment options and results in a high rate of mortality. We have reported previously on the efficacy of a water-soluble, cationic organometallic compound (Ru-IM) in a TNBC mouse xenograft model with impressive tumor reduction and targeted tumor drug accumulation. Ru-IM inhibits cancer hallmarks such as migration, angiogenesis, and invasion in TNBC cells by a mechanism that generates apoptotic cell death. Ru-IM displays little interaction with DNA and appears to act by a P53-independent pathway. We report here on the mitochondrial alterations caused by Ru-IM treatment and detail the inhibitory properties of Ru-IM in the PI3K/AKT/mTOR pathway in MDA-MB-231 cells. Lastly, we describe the results of an efficacy study of the TNBC xenografted mouse model with Ru-IM and Olaparib monotherapy and combinatory treatments. We find 59% tumor shrinkage with Ru-IM and 65% with the combination. Histopathological analysis confirmed no test-article-related toxicity. Immunohistochemical analysis indicated an inhibition of the angiogenic marker CD31 and increased levels of apoptotic cleaved caspase 3 marker, along with a slight inhibition of p-mTOR. Taken together, the effects of Ru-IM in vitro show similar trends and translation in vivo. Our investigation underscores the therapeutic potential of Ru-IM in addressing the challenges posed by TNBC as evidenced by its robust efficacy in inhibiting key cancer hallmarks, substantial tumor reduction, and minimal systemic toxicity.
Collapse
Affiliation(s)
- Nazia Nayeem
- Department
of Chemistry, Brooklyn College, The City
University of New York, Brooklyn, New York 11210, United States
- Brooklyn
College Cancer Center, Brooklyn College, The City University of New York, Brooklyn, New York 11210, United States
- Biology
PhD Program The Graduate Center, The City
University of New York, New York, New York 10016, United States
| | - Sami Sauma
- Biology
PhD Program The Graduate Center, The City
University of New York, New York, New York 10016, United States
- Neuroscience
Initiative, Advanced Science Research Center, New York, New York 10065, United States
- Department
of Biology, City College, The City University
of New York, New York, New York 10031, United States
| | - Afruja Ahad
- Department
of Chemistry, Brooklyn College, The City
University of New York, Brooklyn, New York 11210, United States
- Brooklyn
College Cancer Center, Brooklyn College, The City University of New York, Brooklyn, New York 11210, United States
- Biology
PhD Program The Graduate Center, The City
University of New York, New York, New York 10016, United States
- Radiology, Memorial Sloan Kettering Cancer Center, New York, New York 10031, United States
| | - Rachele Rameau
- Biology
PhD Program The Graduate Center, The City
University of New York, New York, New York 10016, United States
- Department
of Biology, City College, The City University
of New York, New York, New York 10031, United States
| | - Sophia Kebadze
- Department
of Chemistry, Brooklyn College, The City
University of New York, Brooklyn, New York 11210, United States
- Brooklyn
College Cancer Center, Brooklyn College, The City University of New York, Brooklyn, New York 11210, United States
| | - Mark Bazett
- Bold
Therapeutics Inc., Vancouver, British Columbia V6C 1E1, Canada
| | - Brian J. Park
- Bold
Therapeutics Inc., Vancouver, British Columbia V6C 1E1, Canada
| | - Patrizia Casaccia
- Neuroscience
Initiative, Advanced Science Research Center, New York, New York 10065, United States
| | - Swayam Prabha
- Fels
Cancer Institute for Personalized Medicine and Department of Cancer
and Cellular Biology, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania 19104, United States
- Cancer
Signaling and Tumor Microenvironment Program, Fox Chase Center, Temple University, Philadelphia, Pennsylvania 19111, United States
| | - Karen Hubbard
- Biology
PhD Program The Graduate Center, The City
University of New York, New York, New York 10016, United States
- Department
of Biology, City College, The City University
of New York, New York, New York 10031, United States
| | - Maria Contel
- Department
of Chemistry, Brooklyn College, The City
University of New York, Brooklyn, New York 11210, United States
- Brooklyn
College Cancer Center, Brooklyn College, The City University of New York, Brooklyn, New York 11210, United States
- Biology
PhD Program The Graduate Center, The City
University of New York, New York, New York 10016, United States
- Chemistry
PhD Program, The Graduate Center, The City
University of New York, New York, New York 10016, United States
- Biochemistry
PhD Program, The Graduate Center, The City
University of New York, New York, New York 10016, United States
| |
Collapse
|
4
|
Shin G, Hyun S, Kim D, Choi Y, Kim KH, Kim D, Kwon S, Kim YS, Yang SH, Yu J. Cyclohexylalanine-Containing α-Helical Amphipathic Peptide Targets Cardiolipin, Rescuing Mitochondrial Dysfunction in Kidney Injury. J Med Chem 2024; 67:3385-3399. [PMID: 38112308 PMCID: PMC10945481 DOI: 10.1021/acs.jmedchem.3c01578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 12/05/2023] [Accepted: 12/06/2023] [Indexed: 12/21/2023]
Abstract
Mitochondrial dysfunction is linked to degenerative diseases, resulting from cardiolipin (CL)-induced disruption of cristae structure in the inner mitochondrial membrane (IMM); therefore, preserving cristae and preventing CL remodeling offer effective strategies to maintain mitochondrial function. To identify reactive oxygen species (ROS)-blocking agents against mitochondrial dysfunction, a library of cyclohexylamine-containing cell-penetrating α-helical amphipathic "bundle" peptides were screened. Among these, CMP3013 is selectively bound to abnormal mitochondria, preserving the cristae structure impaired by mitochondria-damaging agents. With a stronger affinity for CL compared with other IMM lipid components, CMP3013 exhibited high selectivity. Consequently, it protected cristae, reduced ROS production, and enhanced adenosine triphosphate (ATP) generation. In mouse models of acute kidney injury, a 1 mg/kg dose of CMP3013 demonstrated remarkable efficacy, highlighting its potential as a therapeutic agent for mitochondrial dysfunction-related disorders. Overall, CMP3013 represents a promising agent for mitigating mitochondrial dysfunction and associated diseases.
Collapse
Affiliation(s)
- Gwangsu Shin
- Department
of Chemistry & Education, Seoul National
University, Seoul 08826, Korea
| | - Soonsil Hyun
- Department
of Chemistry & Education, Seoul National
University, Seoul 08826, Korea
| | - Dongwoo Kim
- Department
of Chemistry & Education, Seoul National
University, Seoul 08826, Korea
| | | | - Kyu Hong Kim
- Department
of Biomedical Sciences, Seoul National University
Graduate School, Seoul 03080, Korea
| | - Dongmin Kim
- CAMP
Therapeutics Co., Ltd., Seoul 08826, Korea
| | - Soie Kwon
- Department
of Internal Medicine, Seoul National University
Hospital, Seoul 03080, Korea
| | - Yon Su Kim
- Department
of Internal Medicine, Seoul National University
Hospital, Seoul 03080, Korea
- Kidney
Research Institute, Seoul National University, Seoul 03080, Korea
- Biomedical
Research Institute, Seoul National University
Hospital, Seoul 03080, Republic of Korea
| | - Seung Hee Yang
- Kidney
Research Institute, Seoul National University, Seoul 03080, Korea
- Biomedical
Research Institute, Seoul National University
Hospital, Seoul 03080, Republic of Korea
| | - Jaehoon Yu
- Department
of Chemistry & Education, Seoul National
University, Seoul 08826, Korea
- CAMP
Therapeutics Co., Ltd., Seoul 08826, Korea
| |
Collapse
|
5
|
Kushnireva L, Segal M, Korkotian E. Cultured Rat Hippocampal Neurons Exposed to the Mitochondrial Uncoupler Carbonyl Cyanide Chlorophenylhydrazone Undergo a Rapid, Presenilin-Dependent Change in Neuronal Properties. Int J Mol Sci 2024; 25:578. [PMID: 38203751 PMCID: PMC10779238 DOI: 10.3390/ijms25010578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 12/28/2023] [Accepted: 12/28/2023] [Indexed: 01/12/2024] Open
Abstract
Presenilin 1 (PS1) is a transmembrane proteolytic subunit of γ-secretase that cleaves amyloid precursor proteins. Mutations in PS1 (mPS1) are associated with early-onset familial Alzheimer's disease (AD). The link between mutated PS1, mitochondrial calcium regulation, and AD has been studied extensively in different test systems. Despite the wide-ranging role of mPS1 in AD, there is a paucity of information on the link between PS1 and neuronal cell death, a hallmark of AD. In the present study, we employed the selective mitochondrial uncoupler carbonyl cyanide chlorophenylhydrazone (CCCP) and compared the reactivity of mPS1-transfected cultured rat hippocampal neurons with PS1 and control neurons in a situation of impaired mitochondrial functions. CCCP causes a slow rise in cytosolic and mitochondrial calcium in all three groups of neurons, with the mPS1 neurons demonstrating a faster rise. Consequently, mPS1 neurons were depolarized by CCCP and measured with TMRM, a mitochondrial voltage indicator, more than the other two groups. Morphologically, CCCP produced more filopodia in mPS1 neurons than in the other two groups, which were similarly affected by the drug. Finally, mPS1 transfected neurons tended to die from prolonged exposure to CCCP sooner than the other groups, indicating an increase in vulnerability associated with a lower ability to regulate excess cytosolic calcium.
Collapse
Affiliation(s)
- Liliia Kushnireva
- Faculty of Biology, Perm State University, 614068 Perm, Russia;
- Department of Immunology and Regenerative Biology, The Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Menahem Segal
- Department of Brain Sciences, The Weizmann Institute of Science, Rehovot 7610001, Israel;
| | - Eduard Korkotian
- Department of Brain Sciences, The Weizmann Institute of Science, Rehovot 7610001, Israel;
| |
Collapse
|
6
|
Bar-Tana J. TorS - Reframing a rational for type 2 diabetes treatment. Diabetes Metab Res Rev 2024; 40:e3712. [PMID: 37615286 DOI: 10.1002/dmrr.3712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2023] [Revised: 05/11/2023] [Accepted: 08/04/2023] [Indexed: 08/25/2023]
Abstract
The mammalian target of rapamycin complex 1 syndrome (Tors), paradigm implies an exhaustive cohesive disease entity driven by a hyperactive mTORC1, and which includes obesity, type 2 diabetic hyperglycemia, diabetic dyslipidemia, diabetic cardiomyopathy, diabetic nephropathy, diabetic peripheral neuropathy, hypertension, atherosclerotic cardiovascular disease, non-alcoholic fatty liver disease, some cancers, neurodegeneration, polycystic ovary syndrome, psoriasis and other. The TorS paradigm may account for the efficacy of standard-of-care treatments of type 2 diabetes (T2D) in alleviating the glycaemic and non-glycaemic diseases of TorS in T2D and non-T2D patients. The TorS paradigm may generate novel treatments for TorS diseases.
Collapse
|
7
|
Zhou Z, Jiang W, Yan J, Liu H, Ren M, Li Y, Liu Z, Yao X, Li T, Ma N, Chen B, Guan W, Yang M. Trichostatin A enhances the titanium rods osseointegration in osteoporotic rats by the inhibition of oxidative stress through activating the AKT/Nrf2 pathway. Sci Rep 2023; 13:22967. [PMID: 38151509 PMCID: PMC10752907 DOI: 10.1038/s41598-023-50108-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 12/15/2023] [Indexed: 12/29/2023] Open
Abstract
The use of titanium implants as fixed supports following fractures in patients with OP can often result in sterile loosening and poor osseointegration. Oxidative stress has been shown to play a particularly important role in this process. While TSA has been reported to facilitate in vivo osteogenesis, the underlying mechanisms remain to be clarified. It also remains unclear whether TSA can improve the osseointegration of titanium implants. This study investigated whether TSA could enhance the osseointegration of titanium rods by activating AKT/Nrf2 pathway signaling, thereby suppressing oxidative stress. MC3T3-E1 cells treated with CCCP to induce oxidative stress served as an in vitro model, while an OVX-induced OP rat model was employed for in vivo analysis of titanium rod implantation. In vitro, TSA treatment of CCCP-treated MC3T3-E1 cells resulted in the upregulation of osteogenic proteins together with increased AKT, total Nrf2, nuclear Nrf2, HO-1, and NQO1 expression, enhanced mitochondrial functionality, and decreased oxidative damage. Notably, the PI3K/AKT inhibitor LY294002 reversed these effects. In vivo, TSA effectively enhanced the microstructural characteristics of distal femur trabecular bone, increased BMSCs mineralization capacity, promoted bone formation, and improved the binding of titanium implants to the surrounding tissue. Finally, our results showed that TSA could reverse oxidative stress-induced cell damage while promoting bone healing and improving titanium rods' osseointegration through AKT/Nrf2 pathway activation.
Collapse
Affiliation(s)
- Zhi Zhou
- Department of Traumatology and Orthopedics, Yijishan Hospital, Wannan Medical College, Wuhu, 241001, Anhui, People's Republic of China
| | - Wenkai Jiang
- Department of Traumatology and Orthopedics, Yijishan Hospital, Wannan Medical College, Wuhu, 241001, Anhui, People's Republic of China
| | - Junjie Yan
- Department of Traumatology and Orthopedics, Yijishan Hospital, Wannan Medical College, Wuhu, 241001, Anhui, People's Republic of China
| | - Hedong Liu
- Department of Traumatology and Orthopedics, Yijishan Hospital, Wannan Medical College, Wuhu, 241001, Anhui, People's Republic of China
| | - Maoxian Ren
- Department of Traumatology and Orthopedics, Yijishan Hospital, Wannan Medical College, Wuhu, 241001, Anhui, People's Republic of China
| | - Yang Li
- Department of Traumatology and Orthopedics, Yijishan Hospital, Wannan Medical College, Wuhu, 241001, Anhui, People's Republic of China
| | - Zhiyi Liu
- Department of Traumatology and Orthopedics, Yijishan Hospital, Wannan Medical College, Wuhu, 241001, Anhui, People's Republic of China
| | - Xuewei Yao
- Department of Traumatology and Orthopedics, Yijishan Hospital, Wannan Medical College, Wuhu, 241001, Anhui, People's Republic of China
| | - Tianlin Li
- Department of Traumatology and Orthopedics, Yijishan Hospital, Wannan Medical College, Wuhu, 241001, Anhui, People's Republic of China
| | - Nengfeng Ma
- Department of Traumatology and Orthopedics, Yijishan Hospital, Wannan Medical College, Wuhu, 241001, Anhui, People's Republic of China
| | - Bing Chen
- Department of Traumatology and Orthopedics, Yijishan Hospital, Wannan Medical College, Wuhu, 241001, Anhui, People's Republic of China
| | - Wengang Guan
- Department of Traumatology and Orthopedics, Yijishan Hospital, Wannan Medical College, Wuhu, 241001, Anhui, People's Republic of China
| | - Min Yang
- Department of Traumatology and Orthopedics, Yijishan Hospital, Wannan Medical College, Wuhu, 241001, Anhui, People's Republic of China.
| |
Collapse
|
8
|
Srivastava V, Gross E. Mitophagy-promoting agents and their ability to promote healthy-aging. Biochem Soc Trans 2023; 51:1811-1846. [PMID: 37650304 PMCID: PMC10657188 DOI: 10.1042/bst20221363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 08/07/2023] [Accepted: 08/09/2023] [Indexed: 09/01/2023]
Abstract
The removal of damaged mitochondrial components through a process called mitochondrial autophagy (mitophagy) is essential for the proper function of the mitochondrial network. Hence, mitophagy is vital for the health of all aerobic animals, including humans. Unfortunately, mitophagy declines with age. Many age-associated diseases, including Alzheimer's and Parkinson's, are characterized by the accumulation of damaged mitochondria and oxidative damage. Therefore, activating the mitophagy process with small molecules is an emerging strategy for treating multiple aging diseases. Recent studies have identified natural and synthetic compounds that promote mitophagy and lifespan. This article aims to summarize the existing knowledge about these substances. For readers' convenience, the knowledge is presented in a table that indicates the chemical data of each substance and its effect on lifespan. The impact on healthspan and the molecular mechanism is reported if known. The article explores the potential of utilizing a combination of mitophagy-inducing drugs within a therapeutic framework and addresses the associated challenges of this strategy. Finally, we discuss the process that balances mitophagy, i.e. mitochondrial biogenesis. In this process, new mitochondrial components are generated to replace the ones cleared by mitophagy. Furthermore, some mitophagy-inducing substances activate biogenesis (e.g. resveratrol and metformin). Finally, we discuss the possibility of combining mitophagy and biogenesis enhancers for future treatment. In conclusion, this article provides an up-to-date source of information about natural and synthetic substances that activate mitophagy and, hopefully, stimulates new hypotheses and studies that promote healthy human aging worldwide.
Collapse
Affiliation(s)
- Vijigisha Srivastava
- Faculty of Medicine, IMRIC Department of Biochemistry and Molecular Biology, The Hebrew University of Jerusalem, PO Box 12271, Jerusalem, Israel
| | - Einav Gross
- Faculty of Medicine, IMRIC Department of Biochemistry and Molecular Biology, The Hebrew University of Jerusalem, PO Box 12271, Jerusalem, Israel
| |
Collapse
|
9
|
Hagiwara T, Minami R, Ushio C, Yokota N, Kawahara H. Proteotoxic stresses stimulate dissociation of UBL4A from the tail-anchored protein recognition complex. Biochem J 2023; 480:1583-1598. [PMID: 37747814 PMCID: PMC10586765 DOI: 10.1042/bcj20230267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 09/21/2023] [Accepted: 09/25/2023] [Indexed: 09/27/2023]
Abstract
Inclusion body formation is associated with cytotoxicity in a number of neurodegenerative diseases. However, the molecular basis of the toxicity caused by the accumulation of aggregation-prone proteins remains controversial. In this study, we found that disease-associated inclusions induced by elongated polyglutamine chains disrupt the complex formation of BAG6 with UBL4A, a mammalian homologue of yeast Get5. UBL4A also dissociated from BAG6 in response to proteotoxic stresses such as proteasomal inhibition and mitochondrial depolarization. These findings imply that the cytotoxicity of pathological protein aggregates might be attributed in part to disruption of the BAG6-UBL4A complex that is required for the biogenesis of tail-anchored proteins.
Collapse
Affiliation(s)
- Takumi Hagiwara
- Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Ryosuke Minami
- Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan
| | - Chizuru Ushio
- Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Naoto Yokota
- Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Hiroyuki Kawahara
- Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
- Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan
| |
Collapse
|
10
|
Titus AS, Sung EA, Zablocki D, Sadoshima J. Mitophagy for cardioprotection. Basic Res Cardiol 2023; 118:42. [PMID: 37798455 PMCID: PMC10556134 DOI: 10.1007/s00395-023-01009-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 09/13/2023] [Accepted: 09/14/2023] [Indexed: 10/07/2023]
Abstract
Mitochondrial function is maintained by several strictly coordinated mechanisms, collectively termed mitochondrial quality control mechanisms, including fusion and fission, degradation, and biogenesis. As the primary source of energy in cardiomyocytes, mitochondria are the central organelle for maintaining cardiac function. Since adult cardiomyocytes in humans rarely divide, the number of dysfunctional mitochondria cannot easily be diluted through cell division. Thus, efficient degradation of dysfunctional mitochondria is crucial to maintaining cellular function. Mitophagy, a mitochondria specific form of autophagy, is a major mechanism by which damaged or unnecessary mitochondria are targeted and eliminated. Mitophagy is active in cardiomyocytes at baseline and in response to stress, and plays an essential role in maintaining the quality of mitochondria in cardiomyocytes. Mitophagy is mediated through multiple mechanisms in the heart, and each of these mechanisms can partially compensate for the loss of another mechanism. However, insufficient levels of mitophagy eventually lead to mitochondrial dysfunction and the development of heart failure. In this review, we discuss the molecular mechanisms of mitophagy in the heart and the role of mitophagy in cardiac pathophysiology, with the focus on recent findings in the field.
Collapse
Affiliation(s)
- Allen Sam Titus
- Department of Cell Biology and Molecular Medicine, Cardiovascular Research Institute, Rutgers New Jersey Medical School, 185 South Orange Ave, MSB G-609, Newark, NJ, 07103, USA
| | - Eun-Ah Sung
- Department of Cell Biology and Molecular Medicine, Cardiovascular Research Institute, Rutgers New Jersey Medical School, 185 South Orange Ave, MSB G-609, Newark, NJ, 07103, USA
| | - Daniela Zablocki
- Department of Cell Biology and Molecular Medicine, Cardiovascular Research Institute, Rutgers New Jersey Medical School, 185 South Orange Ave, MSB G-609, Newark, NJ, 07103, USA
| | - Junichi Sadoshima
- Department of Cell Biology and Molecular Medicine, Cardiovascular Research Institute, Rutgers New Jersey Medical School, 185 South Orange Ave, MSB G-609, Newark, NJ, 07103, USA.
| |
Collapse
|
11
|
Zhang S, Wang J, Ahn J. Advances in the Discovery of Efflux Pump Inhibitors as Novel Potentiators to Control Antimicrobial-Resistant Pathogens. Antibiotics (Basel) 2023; 12:1417. [PMID: 37760714 PMCID: PMC10525980 DOI: 10.3390/antibiotics12091417] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 09/04/2023] [Accepted: 09/06/2023] [Indexed: 09/29/2023] Open
Abstract
The excessive use of antibiotics has led to the emergence of multidrug-resistant (MDR) pathogens in clinical settings and food-producing animals, posing significant challenges to clinical management and food control. Over the past few decades, the discovery of antimicrobials has slowed down, leading to a lack of treatment options for clinical infectious diseases and foodborne illnesses. Given the increasing prevalence of antibiotic resistance and the limited availability of effective antibiotics, the discovery of novel antibiotic potentiators may prove useful for the treatment of bacterial infections. The application of antibiotics combined with antibiotic potentiators has demonstrated successful outcomes in bench-scale experiments and clinical settings. For instance, the use of efflux pump inhibitors (EPIs) in combination with antibiotics showed effective inhibition of MDR pathogens. Thus, this review aims to enable the possibility of using novel EPIs as potential adjuvants to effectively control MDR pathogens. Specifically, it provides a comprehensive summary of the advances in novel EPI discovery and the underlying mechanisms that restore antimicrobial activity. In addition, we also characterize plant-derived EPIs as novel potentiators. This review provides insights into current challenges and potential strategies for future advancements in fighting antibiotic resistance.
Collapse
Affiliation(s)
- Song Zhang
- Department of Biomedical Science, Kangwon National University, Chuncheon 24341, Republic of Korea;
| | - Jun Wang
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao 266109, China
| | - Juhee Ahn
- Department of Biomedical Science, Kangwon National University, Chuncheon 24341, Republic of Korea;
- Institute of Bioscience and Biotechnology, Kangwon National University, Chuncheon 24341, Republic of Korea
| |
Collapse
|
12
|
Payea MJ, Dar SA, Malla S, Maragkakis M. Ribonucleic Acid-Mediated Control of Protein Translation Under Stress. Antioxid Redox Signal 2023; 39:374-389. [PMID: 37470212 PMCID: PMC10443204 DOI: 10.1089/ars.2023.0233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Accepted: 05/30/2023] [Indexed: 07/21/2023]
Abstract
Significance: The need of cells to constantly respond to endogenous and exogenous stress has necessitated the evolution of pathways to counter the deleterious effects of stress and to restore cellular homeostasis. The inability to activate a timely and adequate response can lead to disease and is a hallmark of aging. Besides protein-coding genes, cells contain a plethora of noncoding regulatory elements that allow cells to respond rapidly and efficiently to external stimuli by activating highly specific and tightly controlled mechanisms. Many of these programs converge on the regulation of translation, one of the most energy-consuming processes in cells. Recent Advances: The noncoding dimension of translational regulation includes short and long noncoding ribonucleic acids (ncRNAs), as well as messenger RNA features, such as the sequence and modification status of the 5' and 3' untranslated regions (UTRs), that do not change the amino acid sequence of the produced protein. Critical Issues: In this review, we discuss the regulatory role of the nonprotein-coding components of translation under stress, particularly oxidative stress. We conclude that the regulation of translation through ncRNAs, UTRs, and nucleotide modifications is emerging as a critical component of the stress response. Future Directions: Further areas of study using long-read sequencing technologies will be discussed. Antioxid. Redox Signal. 39, 374-389.
Collapse
Affiliation(s)
- Matthew J. Payea
- Laboratory of Genetics and Genomics, National Institute on Aging, Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| | - Showkat A. Dar
- Laboratory of Genetics and Genomics, National Institute on Aging, Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| | - Sulochan Malla
- Laboratory of Genetics and Genomics, National Institute on Aging, Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| | - Manolis Maragkakis
- Laboratory of Genetics and Genomics, National Institute on Aging, Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| |
Collapse
|
13
|
Park D, Yu Y, Kim JH, Lee J, Park J, Hong K, Seo JK, Lim C, Min KT. Suboptimal Mitochondrial Activity Facilitates Nuclear Heat Shock Responses for Proteostasis and Genome Stability. Mol Cells 2023; 46:374-386. [PMID: 37077029 PMCID: PMC10258458 DOI: 10.14348/molcells.2023.2181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 01/16/2023] [Accepted: 01/17/2023] [Indexed: 04/21/2023] Open
Abstract
Thermal stress induces dynamic changes in nuclear proteins and relevant physiology as a part of the heat shock response (HSR). However, how the nuclear HSR is fine-tuned for cellular homeostasis remains elusive. Here, we show that mitochondrial activity plays an important role in nuclear proteostasis and genome stability through two distinct HSR pathways. Mitochondrial ribosomal protein (MRP) depletion enhanced the nucleolar granule formation of HSP70 and ubiquitin during HSR while facilitating the recovery of damaged nuclear proteins and impaired nucleocytoplasmic transport. Treatment of the mitochondrial proton gradient uncoupler masked MRP-depletion effects, implicating oxidative phosphorylation in these nuclear HSRs. On the other hand, MRP depletion and a reactive oxygen species (ROS) scavenger non-additively decreased mitochondrial ROS generation during HSR, thereby protecting the nuclear genome from DNA damage. These results suggest that suboptimal mitochondrial activity sustains nuclear homeostasis under cellular stress, providing plausible evidence for optimal endosymbiotic evolution via mitochondria-to-nuclear communication.
Collapse
Affiliation(s)
- Dongkeun Park
- Department of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Youngim Yu
- Department of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Ji-hyung Kim
- Department of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Jongbin Lee
- Department of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Jongmin Park
- Department of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Kido Hong
- Department of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Jeong-Kon Seo
- UNIST Central Research Facilities (UCRF), Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
| | - Chunghun Lim
- Department of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Kyung-Tai Min
- Department of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| |
Collapse
|
14
|
Rupert C, Aversana CD, Mosca L, Montanaro V, Arcaniolo D, De Sio M, Bilancio A, Altucci L, Palinski W, Pili R, de Nigris F. Therapeutic targeting of P2X4 receptor and mitochondrial metabolism in clear cell renal carcinoma models. J Exp Clin Cancer Res 2023; 42:134. [PMID: 37231503 DOI: 10.1186/s13046-023-02713-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 05/17/2023] [Indexed: 05/27/2023] Open
Abstract
BACKGROUND Clear cell renal cell carcinoma (ccRCC) is the most common subtype of renal cancer. Large-scale metabolomic data have associated metabolic alterations with the pathogenesis and progression of renal carcinoma and have correlated mitochondrial activity with poor survival in a subset of patients. The aim of this study was to determine whether targeting mitochondria-lysosome interaction could be a novel therapeutic approach using patient-derived organoids as avatar for drug response. METHODS RNAseq data analysis and immunohistochemistry were used to show overexpression of Purinergic receptor 4 (P2XR4) in clear cell carcinomas. Seahorse experiments, immunofluorescence and fluorescence cell sorting were used to demonstrate that P2XR4 regulates mitochondrial activity and the balance of radical oxygen species. Pharmacological inhibitors and genetic silencing promoted lysosomal damage, calcium overload in mitochondria and cell death via both necrosis and apoptosis. Finally, we established patient-derived organoids and murine xenograft models to investigate the antitumor effect of P2XR4 inhibition using imaging drug screening, viability assay and immunohistochemistry. RESULTS Our data suggest that oxo-phosphorylation is the main source of tumor-derived ATP in a subset of ccRCC cells expressing P2XR4, which exerts a critical impact on tumor energy metabolism and mitochondrial activity. Prolonged mitochondrial failure induced by pharmacological inhibition or P2XR4 silencing was associated with increased oxygen radical species, changes in mitochondrial permeability (i.e., opening of the transition pore complex, dissipation of membrane potential, and calcium overload). Interestingly, higher mitochondrial activity in patient derived organoids was associated with greater sensitivity to P2XR4 inhibition and tumor reduction in a xenograft model. CONCLUSION Overall, our results suggest that the perturbed balance between lysosomal integrity and mitochondrial activity induced by P2XR4 inhibition may represent a new therapeutic strategy for a subset of patients with renal carcinoma and that individualized organoids may be help to predict drug efficacy.
Collapse
Affiliation(s)
- Christofer Rupert
- Division of Hematology and Oncology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA
| | - Carmela Dell' Aversana
- Institute of Experimental Endocrinology and Oncology, Gaetano Salvatore (IEOS)-CNR, Naples, Italy
- Department of Precision Medicine, University of Campania L. Vanvitelli, Naples, Italy
| | - Laura Mosca
- Department of Precision Medicine, University of Campania L. Vanvitelli, Naples, Italy
| | | | - Davide Arcaniolo
- Department of Women, Child, and General and Specialistic Surgery, University of Campania L. Vanvitelli, Naples, Italy
| | - Marco De Sio
- Department of Women, Child, and General and Specialistic Surgery, University of Campania L. Vanvitelli, Naples, Italy
| | - Antonio Bilancio
- Department of Precision Medicine, University of Campania L. Vanvitelli, Naples, Italy
| | - Lucia Altucci
- Institute of Experimental Endocrinology and Oncology, Gaetano Salvatore (IEOS)-CNR, Naples, Italy
- Department of Precision Medicine, University of Campania L. Vanvitelli, Naples, Italy
- BIOGEM, Ariano Irpino, Avellino, Italy
| | - Wulf Palinski
- Department of Medicine, University of California San Diego, La Jolla, CA, USA
| | - Roberto Pili
- Division of Hematology and Oncology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA.
| | - Filomena de Nigris
- Department of Precision Medicine, University of Campania L. Vanvitelli, Naples, Italy.
| |
Collapse
|
15
|
Li L, Huang T, Yang J, Yang P, Lan H, Liang J, Cai D, Zhong H, Jiao W, Song Y. PINK1/Parkin pathway-mediated mitophagy by AS-IV to explore the molecular mechanism of muscle cell damage. Biomed Pharmacother 2023; 161:114533. [PMID: 36948131 DOI: 10.1016/j.biopha.2023.114533] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 03/04/2023] [Accepted: 03/13/2023] [Indexed: 03/24/2023] Open
Abstract
BACKGROUND Functional disorders of mitochondria are closely related to muscle diseases. Many studies have also shown that oxidative stress can stimulate the production of a large number of reactive oxygen species (ROS), which have various adverse effects on mitochondria and can damage muscle cells. PURPOSE In this study, based on our previous research, we focused on the PINK1/Parkin pathway to explore the mechanism by which AS-IV alleviates muscle injury by inhibiting excessive mitophagy. METHODS L6 myoblasts were treated with AS-IV after stimulation with hydrogen peroxide (H2O2) and carbonyl cyanide m-chlorophenylhydrazone (CCCP). Then, we detected the related indices of oxidative stress and mitophagy by different methods. A PINK1 knockdown cell line was established by lentiviral infection to obtain further evidence that AS-IV reduces mitochondrial damage through PINK1/Parkin. RESULTS After mitochondrial damage, the expression of malondialdehyde (MDA) and intracellular ROS in L6 myoblasts significantly increased, while the expression of superoxide dismutase (SOD) and ATP decreased. The mRNA and protein expression levels of Tom20 and Tim23 were decreased, while those of VDAC1 were increased. PINK1, Parkin, and LC3 II mRNA and protein expression increased, and P62 mRNA and protein expression decreased·H2O2 combined with CCCP strongly activated the mitophagy pathway and impaired mitochondrial function. However, abnormal expression of these factors could be reversed after treatment with AS-IV, and excessive mitochondrial autophagy could also be reversed, thus restoring the regulatory function of mitochondria. However, AS-IV-adjusted function was resisted after PINK1 knockdown. CONCLUSION AS-IV is a potential drug for myasthenia gravis (MG), and its treatment mechanism is related to mediating mitophagy and restoring mitochondrial function through the PINK1/Parkin pathway.
Collapse
Affiliation(s)
- Lanqi Li
- Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China; Institute of Pi-Wei, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Tingjuan Huang
- Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China; Institute of Pi-Wei, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Jie Yang
- Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China; Institute of Pi-Wei, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Peidan Yang
- Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China; Institute of Pi-Wei, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Haixia Lan
- Department of Pediatrics, The 969th Hospital of the PLA joint Logistics Support Force, Hohhot, Inner Mongolia, China
| | - Jian Liang
- School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Donghong Cai
- Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China; Institute of Pi-Wei, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Huiya Zhong
- Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China; Institute of Pi-Wei, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Wei Jiao
- Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China; Institute of Pi-Wei, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Yafang Song
- Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China; Institute of Pi-Wei, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China.
| |
Collapse
|
16
|
Zhou Z, Fan Y, Zong R, Tan K. The mitochondrial unfolded protein response: A multitasking giant in the fight against human diseases. Ageing Res Rev 2022; 81:101702. [PMID: 35908669 DOI: 10.1016/j.arr.2022.101702] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 07/15/2022] [Accepted: 07/26/2022] [Indexed: 02/06/2023]
Abstract
Mitochondria, which serve as the energy factories of cells, are involved in cell differentiation, calcium homeostasis, amino acid and fatty acid metabolism and apoptosis. In response to environmental stresses, mitochondrial homeostasis is regulated at both the organelle and molecular levels to effectively maintain the number and function of mitochondria. The mitochondrial unfolded protein response (UPRmt) is an adaptive intracellular stress mechanism that responds to stress signals by promoting the transcription of genes encoding mitochondrial chaperones and proteases. The mechanism of the UPRmt in Caenorhabditis elegans (C. elegans) has been clarified over time, and the main regulatory factors include ATFS-1, UBL-5 and DVE-1. In mammals, the activation of the UPRmt involves eIF2α phosphorylation and the uORF-regulated expression of CHOP, ATF4 and ATF5. Several additional factors, such as SIRT3 and HSF1, are also involved in regulating the UPRmt. A deep and comprehensive exploration of the UPRmt can provide new directions and strategies for the treatment of human diseases, including aging, neurodegenerative diseases, cardiovascular diseases and diabetes. In this review, we mainly discuss the function of UPRmt, describe the regulatory mechanisms of UPRmt in C. elegans and mammals, and summarize the relationship between UPRmt and various human diseases.
Collapse
Affiliation(s)
- Zixin Zhou
- Key Laboratory of Molecular and Cellular Biology of Ministry of Education, Hebei Province Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei 050024, China; State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, University of Chinese Academy of Sciences, Beijing, China
| | - Yumei Fan
- Key Laboratory of Molecular and Cellular Biology of Ministry of Education, Hebei Province Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei 050024, China
| | - Ruikai Zong
- Key Laboratory of Molecular and Cellular Biology of Ministry of Education, Hebei Province Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei 050024, China
| | - Ke Tan
- Key Laboratory of Molecular and Cellular Biology of Ministry of Education, Hebei Province Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei 050024, China.
| |
Collapse
|
17
|
Kushnireva L, Basnayake K, Holcman D, Segal M, Korkotian E. Dynamic Regulation of Mitochondrial [Ca 2+] in Hippocampal Neurons. Int J Mol Sci 2022; 23:ijms232012321. [PMID: 36293178 PMCID: PMC9604040 DOI: 10.3390/ijms232012321] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 09/29/2022] [Accepted: 10/10/2022] [Indexed: 11/07/2022] Open
Abstract
While neuronal mitochondria have been studied extensively in their role in health and disease, the rules that govern calcium regulation in mitochondria remain somewhat vague. In the present study using cultured rat hippocampal neurons transfected with the mtRCaMP mitochondrial calcium sensor, we investigated the effects of cytosolic calcium surges on the dynamics of mitochondrial calcium ([Ca2+]m). Cytosolic calcium ([Ca2+]c) was measured using the high affinity sensor Fluo-2. We recorded two types of calcium events: local and global ones. Local events were limited to a small, 2–5 µm section of the dendrite, presumably caused by local synaptic activity, while global events were associated with network bursts and extended throughout the imaged dendrite. In both cases, cytosolic surges were followed by a delayed rise in [Ca2+]m. In global events, the rise lasted longer and was observed in all mitochondrial clusters. At the end of the descending part of the global event, [Ca2+]m was still high. Global events were accompanied by short and rather high [Ca2+]m surges which we called spikelets, and were present until the complete decay of the cytosolic event. In the case of local events, selective short-term responses were limited to the part of the mitochondrial cluster that was located directly in the center of [Ca2+]c activity, and faded quickly, while responses in the neighboring regions were rarely observed. Caffeine (which recruits ryanodine receptors to supply calcium to the mitochondria), and carbonyl cyanide m-chlorophenyl hydrazine (CCCP, a mitochondrial uncoupler) could affect [Ca2+]m in both global and local events. We constructed a computational model to simulate the fundamental role of mitochondria in restricting calcium signals within a narrow range under synapses, preventing diffusion into adjacent regions of the dendrite. Our results indicate that local cytoplasmic and mitochondrial calcium concentrations are highly correlated. This reflects a key role of signaling pathways that connect the postsynaptic membrane to local mitochondrial clusters.
Collapse
Affiliation(s)
- Liliya Kushnireva
- Department of Brain Sciences, The Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Kanishka Basnayake
- Computational Biology and Applied Mathematics (IBENS), Ecole Normale Supérieure-PSL, 75005 Paris, France
| | - David Holcman
- Computational Biology and Applied Mathematics (IBENS), Ecole Normale Supérieure-PSL, 75005 Paris, France
| | - Menahem Segal
- Department of Brain Sciences, The Weizmann Institute of Science, Rehovot 7610001, Israel
- Correspondence:
| | - Eduard Korkotian
- Department of Brain Sciences, The Weizmann Institute of Science, Rehovot 7610001, Israel
| |
Collapse
|
18
|
Jiang L, Dong R, Xu M, Liu Y, Xu J, Ma Z, Xia T, Gu X. Inhibition of the integrated stress response reverses oxidative stress damage-induced postoperative cognitive dysfunction. Front Cell Neurosci 2022; 16:992869. [PMID: 36212697 PMCID: PMC9534309 DOI: 10.3389/fncel.2022.992869] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Accepted: 08/29/2022] [Indexed: 11/29/2022] Open
Abstract
Postoperative cognitive dysfunction (POCD) is a common complication following anesthesia and surgery that might lead to a decline in learning and memory. Oxidative stress damage is one of the pathogenic mechanisms underlying POCD. Recent studies had shown that the integrated stress response (ISR) is closely related to oxidative stress. The core response of the ISR is phosphorylation of eIF2α. Various cellular stress stimuli trigger activation of eIF2α kinases, thus causing phosphorylation of eIF2α. ISR is associated with many neurodegenerative diseases; however, the relationship between POCD and ISR has not been defined. In the present study, the tibias in 4-month-old male C57BL/6 mice were fractured under isoflurane anesthesia to establish the POCD animal model. Cognitive function was assessed by fear conditioning tests and the Y-maze from 3 to 14 days post-surgery. Western blot was used to determine the levels of PeIF2α, eIF2α, ATF4, GADD34, CHOP, BDNF, proBDNF, and p-NR2B expression. The levels of reactive oxygen species (ROS), superoxide dismutase (SOD), and malondialdehyde (MDA) were measured to determine oxidative stress in hippocampal tissues. After tibial fracture surgery in mice, the hippocampus had increased levels of PeIF2α, ATF4, GADD34, and CHOP protein, ROS-positive cells, and average fluorescence intensity, SOD activity was decreased, and the MDA level was increased. The ISR inhibitor, ISRIB, reduced the levels of PeIF2α, ATF4, GADD34, and CHOP protein, and alleviated oxidative stress in the hippocampus of POCD mice. Moreover, ISRIB ameliorated cognitive dysfunction in POCD mice. Our findings suggested that targeting ISR may represent an effective approach to combat POCD.
Collapse
Affiliation(s)
- Linhao Jiang
- Department of Anesthesiology, Affiliated Drum Tower Hospital of Medical School of Nanjing University, Nanjing, China
- Medical School, Nanjing University, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University, Nanjing, China
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China
| | - Rui Dong
- Department of Anesthesiology, Affiliated Drum Tower Hospital of Medical School of Nanjing University, Nanjing, China
- Medical School, Nanjing University, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University, Nanjing, China
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China
| | - Minhui Xu
- Medical School, Nanjing University, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University, Nanjing, China
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China
| | - Yujia Liu
- Department of Anesthesiology, Affiliated Drum Tower Hospital of Medical School of Nanjing University, Nanjing, China
- Medical School, Nanjing University, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University, Nanjing, China
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China
| | - Jiyan Xu
- Department of Anesthesiology, Affiliated Drum Tower Hospital of Medical School of Nanjing University, Nanjing, China
- Medical School, Nanjing University, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University, Nanjing, China
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China
| | - Zhengliang Ma
- Department of Anesthesiology, Affiliated Drum Tower Hospital of Medical School of Nanjing University, Nanjing, China
- *Correspondence: Xiaoping Gu Tianjiao Xia Zhengliang Ma
| | - Tianjiao Xia
- Medical School, Nanjing University, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University, Nanjing, China
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China
- *Correspondence: Xiaoping Gu Tianjiao Xia Zhengliang Ma
| | - Xiaoping Gu
- Department of Anesthesiology, Affiliated Drum Tower Hospital of Medical School of Nanjing University, Nanjing, China
- *Correspondence: Xiaoping Gu Tianjiao Xia Zhengliang Ma
| |
Collapse
|
19
|
How to Use Respiratory Chain Inhibitors in Toxicology Studies-Whole-Cell Measurements. Int J Mol Sci 2022; 23:ijms23169076. [PMID: 36012337 PMCID: PMC9409450 DOI: 10.3390/ijms23169076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 08/01/2022] [Accepted: 08/08/2022] [Indexed: 11/16/2022] Open
Abstract
Mitochondrial electron transport chain (ETC) inhibition is a phenomenon interesting in itself and serves as a tool for studying various cellular processes. Despite the fact that searching the term “rotenone” in PubMed returns more than 6900 results, there are many discrepancies regarding the directions of changes reported to be caused by this RTC inhibitor in the delicate redox balance of the cell. Here, we performed a multifaceted study of the popular ETC inhibitors rotenone and antimycin A, involving assessment of mitochondrial membrane potential and the production of hydrogen peroxide and superoxide anions at cellular and mitochondrial levels over a wide range of inhibitor concentrations (1 nmol/dm3–100 µmol/dm3). All measurements were performed with whole cells, with accompanying control of ATP levels. Antimycin A was more potent in hindering HepG2 cells’ abilities to produce ATP, decreasing ATP levels even at a 1 nmol/dm3 concentration, while in the case of rotenone, a 10,000-times greater concentration was needed to produce a statistically significant decrease. The amount of hydrogen peroxide produced in the course of antimycin A biological activity increased rapidly at low concentrations and decreased below control level at a high concentration of 100 µmol/dm3. While both inhibitors influenced cellular superoxide anion production in a comparable manner, rotenone caused a greater increase in mitochondrial superoxide anions compared to a modest impact for antimycin A. IC50 values for rotenone and antimycin A with respect to HepG2 cell survival were of the same order of magnitude, but the survival curve of cells treated with rotenone was clearly biphasic, suggesting a concentration-dependent mode of biological action. We propose a clear experimental setup allowing for complete and credible analysis of the redox state of cells under stress conditions which allows for better understanding of the effects of ETC inhibition.
Collapse
|
20
|
Guidarelli A, Spina A, Fiorani M, Zito E, Cantoni O. Inhibition of activity/expression, or genetic deletion, of ERO1α blunts arsenite geno- and cyto-toxicity. Food Chem Toxicol 2022; 168:113360. [PMID: 35964836 DOI: 10.1016/j.fct.2022.113360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 07/07/2022] [Accepted: 08/06/2022] [Indexed: 11/29/2022]
Abstract
Our recent studies suggest that arsenite stimulates the crosstalk between the inositol 1, 4, 5-triphosphate receptor (IP3R) and the ryanodine receptor (RyR) via a mechanism dependent on endoplasmic reticulum (ER) oxidoreductin1α (ERO1α) up-regulation. Under these conditions, the fraction of Ca2+ released by the RyR via an ERO1α-dependent mechanism was promptly cleared by the mitochondria and critically mediated O2-. formation, responsible for the triggering of time-dependent events associated with strand scission of genomic DNA and delayed mitochondrial apoptosis. We herein report that, in differentiated C2C12 cells, this sequence of events can be intercepted by genetic deletion of ERO1α as well as by EN460, an inhibitor of ERO1α activity. Similar results were obtained for the early effects mediated by arsenite in proliferating U937 cells, in which however the long-term studies were hampered by the intrinsic toxicity of the inhibitor. It was then interesting to observe that ISRIB, an inhibitor of p-eIF2 alpha, was in both cell types devoid of intrinsic toxicity and able to suppress ERO1α expression and the resulting downstream effects leading to arsenite geno- and cyto-toxicity. We therefore conclude that pharmacological inhibition of ERO1α activity, or expression, effectively counteracts the deleterious effects induced by the metalloid via a mechanism associated with prevention of mitochondrial O2-. formation.
Collapse
Affiliation(s)
- Andrea Guidarelli
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Andrea Spina
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Mara Fiorani
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Ester Zito
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy; Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
| | - Orazio Cantoni
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy.
| |
Collapse
|
21
|
Walker BR, Moraes CT. Nuclear-Mitochondrial Interactions. Biomolecules 2022; 12:biom12030427. [PMID: 35327619 PMCID: PMC8946195 DOI: 10.3390/biom12030427] [Citation(s) in RCA: 34] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 02/21/2022] [Accepted: 02/26/2022] [Indexed: 12/12/2022] Open
Abstract
Mitochondria, the cell’s major energy producers, also act as signaling hubs, interacting with other organelles both directly and indirectly. Despite having its own circular genome, the majority of mitochondrial proteins are encoded by nuclear DNA. To respond to changes in cell physiology, the mitochondria must send signals to the nucleus, which can, in turn, upregulate gene expression to alter metabolism or initiate a stress response. This is known as retrograde signaling. A variety of stimuli and pathways fall under the retrograde signaling umbrella. Mitochondrial dysfunction has already been shown to have severe implications for human health. Disruption of retrograde signaling, whether directly associated with mitochondrial dysfunction or cellular environmental changes, may also contribute to pathological deficits. In this review, we discuss known signaling pathways between the mitochondria and the nucleus, examine the possibility of direct contacts, and identify pathological consequences of an altered relationship.
Collapse
Affiliation(s)
- Brittni R. Walker
- Neuroscience Program, University of Miami Miller School of Medicine, 1420 NW 9th Avenue, Rm. 229, Miami, FL 33136, USA;
| | - Carlos T. Moraes
- Department of Neurology, University of Miami Miller School of Medicine, 1420 NW 9th Avenue, Rm. 229, Miami, FL 33136, USA
- Correspondence: ; Tel.: +1-305-243-5858
| |
Collapse
|
22
|
Held JP, Feng G, Saunders BR, Pereira CV, Burkewitz K, Patel MR. A tRNA processing enzyme is a key regulator of the mitochondrial unfolded protein response. eLife 2022; 11:71634. [PMID: 35451962 PMCID: PMC9064297 DOI: 10.7554/elife.71634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 04/21/2022] [Indexed: 11/13/2022] Open
Abstract
The mitochondrial unfolded protein response (UPRmt) has emerged as a predominant mechanism that preserves mitochondrial function. Consequently, multiple pathways likely exist to modulate UPRmt. We discovered that the tRNA processing enzyme, homolog of ELAC2 (HOE-1), is key to UPRmt regulation in Caenorhabditis elegans. We find that nuclear HOE-1 is necessary and sufficient to robustly activate UPRmt. We show that HOE-1 acts via transcription factors ATFS-1 and DVE-1 that are crucial for UPRmt. Mechanistically, we show that HOE-1 likely mediates its effects via tRNAs, as blocking tRNA export prevents HOE-1-induced UPRmt. Interestingly, we find that HOE-1 does not act via the integrated stress response, which can be activated by uncharged tRNAs, pointing toward its reliance on a new mechanism. Finally, we show that the subcellular localization of HOE-1 is responsive to mitochondrial stress and is subject to negative regulation via ATFS-1. Together, we have discovered a novel RNA-based cellular pathway that modulates UPRmt.
Collapse
Affiliation(s)
- James P Held
- Department of Biological Sciences, Vanderbilt UniversityNashvilleUnited States
| | - Gaomin Feng
- Department of Cell and Developmental Biology, Vanderbilt UniversityNashvilleUnited States
| | - Benjamin R Saunders
- Department of Biological Sciences, Vanderbilt UniversityNashvilleUnited States
| | - Claudia V Pereira
- Department of Biological Sciences, Vanderbilt UniversityNashvilleUnited States
| | - Kristopher Burkewitz
- Department of Cell and Developmental Biology, Vanderbilt UniversityNashvilleUnited States
| | - Maulik R Patel
- Department of Biological Sciences, Vanderbilt UniversityNashvilleUnited States,Department of Cell and Developmental Biology, Vanderbilt UniversityNashvilleUnited States,Diabetes Research and Training Center, Vanderbilt University School of MedicineNashvilleUnited States
| |
Collapse
|